<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1126" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>I use pull-pull with vinyl coated kevlar cord it
for rudder, </FONT></DIV>
<DIV><FONT face=Arial size=2>and have never had a failure. But somehow, I
can't<FONT face=Arial size=2> bring </FONT></FONT></DIV>
<DIV><FONT face=Arial size=2><FONT face=Arial size=2>myself to trust pull-pull
linkage for an elevator.</FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I don't like bellcrank systems- I prefer to avoid
the weight</FONT></DIV>
<DIV><FONT face=Arial size=2>and additional linkage points.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Bushed at the rear push rods work OK, some
setups require </FONT></DIV>
<DIV><FONT face=Arial size=2>a bushing or vib</FONT><FONT face=Arial
size=2>ration dampener in the center.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Another possibility Ive used with good success a
few times -</FONT></DIV>
<DIV><FONT face=Arial size=2>Sullivan Precision Rod. It's a
golden rod type system but </FONT></DIV>
<DIV><FONT face=Arial size=2>the inner rod is carbon fiber
reinforced. It comes in</FONT></DIV>
<DIV><FONT face=Arial size=2>2-56 and 4-40 sizes. Using the 4-40
size for pattern birds, </FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT>I set up one </FONT></FONT></FONT><FONT
face=Arial size=2>outer/inner pushrod sytem from the servo to a
</FONT></DIV>
<DIV><FONT face=Arial size=2>point about </FONT><FONT face=Arial size=2>midway
between servo at stab. Then transition </FONT></DIV>
<DIV><FONT face=Arial size=2>to two </FONT><FONT face=Arial
size=2>outer/inner pushrods, one to each stab half. This set
up</FONT></DIV>
<DIV><FONT face=Arial size=2>requires mounting braces every 12 inches or
so. Where</FONT></DIV>
<DIV><FONT face=Arial size=2>you put the one rod to two transition isn't
critical, other than</FONT></DIV>
<DIV><FONT face=Arial size=2>placing it where you can reach it to work
on. Getting the </FONT></DIV>
<DIV><FONT face=Arial size=2>mounting </FONT><FONT face=Arial size=2>braces
into ther rear of a fuse shell may be a </FONT></DIV>
<DIV><FONT face=Arial size=2>difficult reach. Once installed,
it never vibrates or needs</FONT></DIV>
<DIV><FONT face=Arial size=2>maintenance.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Later</FONT></DIV>
<DIV><FONT face=Arial size=2>Ron Lockhart</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tkeithb@attbi.com href="mailto:tkeithb@attbi.com">Keith Black</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, December 07, 2002 2:38
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Elevator control: Pull-pull vs
push rod</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I'm in the process of building a new Aries and am
trying to decide whether to use pull-pull or a push-rod on the elevator. I'd
like to hear some opinions on which is the best way to go. I plan to go with
pull-pull on the rudder, but I'm undecided on the elevator.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The Aries requires no formers so there would be
no problem with space in installing a pull-pull system for the elevator,
however I know there are different theories as to which is the best approach.
If you have an opinion please explain why you feel the way you do (weight,
control accuracy, reliability, etc.).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>For those push-rod proponents I'd be very
interested in hearing your opinion on the best approach to installing a push
rod system. For example using a "Y" push rod with bushings, using an bell
crank, etc. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I look forward to hearing everyone's
opinion.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Keith Black</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>